Costas loop QPSK demodulator

Details Costas loop QPSK demodulator Costas loop QPSK demodulator

1980-09-26

1982-08-10

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329 50, 329124, 375 86, 455208, H03D 318, H03D 324, H04L 2722

Patent

active

043441785

ABSTRACT:
A decision-directed Costas loop demodulator, rather than employing decision circuits, i.e. sample and hold circuits, in the path of each of the I and Q channels, contains a single sample and hold circuit at the output of the crosstalk measurement subtraction circuitry that drives the VCO. Functionally, the same decision-directed sampling process that is carried out by dual channel approach is achieved, yet because the decision/sampling circuitry is located downstream of the crosstalk measurement subtraction circuit, it operates on a relatively slowly varying error signal rather than on the rapidly varying I and Q channel signals.

REFERENCES:
patent: 3638125 (1972-01-01), Goell
patent: 3701948 (1972-10-01), McAuliffe
patent: 4085378 (1978-04-01), Ryan et al.
patent: 4092606 (1978-05-01), Lovelace

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